وَحَدَّثَنِي مَالِكٌ، عَنْ أَبِي جَعْفَرٍ الْقَارِيِّ، أَنَّهُ قَالَ رَأَيْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَشْرَبُ قَائِمًا ‏.‏

Yahya related to me from Malik that Abu Jafar al-Qari said, "Isaw Abdullah ibn Umar drink while standing." Translation Not Available

Book Ref: Muwatta Imam Malik Book 49 Hadith 1688
Web Ref:  Muwatta Imam Malik Book 49 Hadith 15